Last change
on this file was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:mime-type
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File size:
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1 | #include <stdlib.h>
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2 | #include <stdint.h>
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3 | #include "libc.h"
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4 |
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5 | /* Ensure that at least 32 atexit handlers can be registered without malloc */
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6 | #define COUNT 32
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7 |
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8 | static struct fl
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9 | {
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10 | struct fl *next;
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11 | void (*f[COUNT])(void *);
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12 | void *a[COUNT];
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13 | } builtin, *head;
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14 |
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15 | static int slot;
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16 | static volatile int lock[2];
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17 |
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18 | void __funcs_on_exit()
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19 | {
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20 | void (*func)(void *), *arg;
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21 | LOCK(lock);
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22 | for (; head; head=head->next, slot=COUNT) while(slot-->0) {
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23 | func = head->f[slot];
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24 | arg = head->a[slot];
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25 | UNLOCK(lock);
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26 | func(arg);
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27 | LOCK(lock);
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28 | }
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29 | }
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30 |
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31 | void __cxa_finalize(void *dso)
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32 | {
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33 | }
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34 |
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35 | int __cxa_atexit(void (*func)(void *), void *arg, void *dso)
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36 | {
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37 | LOCK(lock);
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38 |
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39 | /* Defer initialization of head so it can be in BSS */
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40 | if (!head) head = &builtin;
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41 |
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42 | /* If the current function list is full, add a new one */
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43 | if (slot==COUNT) {
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44 | struct fl *new_fl = calloc(sizeof(struct fl), 1);
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45 | if (!new_fl) {
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46 | UNLOCK(lock);
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47 | return -1;
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48 | }
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49 | new_fl->next = head;
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50 | head = new_fl;
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51 | slot = 0;
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52 | }
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53 |
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54 | /* Append function to the list. */
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55 | head->f[slot] = func;
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56 | head->a[slot] = arg;
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57 | slot++;
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58 |
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59 | UNLOCK(lock);
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60 | return 0;
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61 | }
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62 |
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63 | static void call(void *p)
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64 | {
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65 | ((void (*)(void))(uintptr_t)p)();
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66 | }
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67 |
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68 | int atexit(void (*func)(void))
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69 | {
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70 | return __cxa_atexit(call, (void *)(uintptr_t)func, 0);
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71 | }
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